Which quantity can be calculated for a solid compound, given only the formula of the compound and the periodic table of the elements?
(1) the density of the compound
(2) the heat of fusion of the compound
(3) the melting point of each element in the compound
(4) the percent composition by mass of each element in the compound

Nonmetal halogen family atmoic mass 35

Which of the following describes a situation where competition between producers exists

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.